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Q.

For the arrangement as shown in the figure, the magnetic induction at the centre is

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a

3μ0iπ4a

b

μ0i4πa(1+π)

c

μ0i4πa

d

3μ0i8a

answer is D.

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Detailed Solution

Magnetic field at the centre, B=μ0iθ4πa=μ0i4πa⋅3π2=3μ0i8a
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